Lock



May 5, 193i. T. ROME-R 1,803,531

Loox

Filed Feb. 29. V1928 Z jllln k Patented May 5, 1931 UNITED STATES 'rnnonon KROMER, .or FREIBURG, GERMANY, nss-rsnon'ro rmiornon KRQMER G Esnnr.T

PATENT OFFICE sCHAr-r MIT BEscHRNKTn-R HAMUNG, or FREIBURG, 1N BnnrsGAU, GERMANY LOCK VApplication lfed lfebruary 29, 191.28, Serial No. 258,074, and in Germany une 7, 1 92'7.

rIhis invention relates to a lock of the kind wherein alock boltV is normally blocked by a tumbler which is supported by a plurality of locking discs and which drops into aligned notches in 4said discs for releasing the bolt, the 'discs being ladjusted individuallyy by means of a spindle which is arranged to slide and lrotate in the lock casing.

The objectof thefinvention is to provide means ne'cessitatin'g'a disarrangement oi the discs beforethe lock is completely opened, and the invention consists essentially in the provision of two tnmblers one of which is adapted to retain the bolt partly shot until a disarrangementof the discshas taken place.

For setting thediscsfone of them is permanently coupledto the spindle for rotary movement and is provided with a raised toothed rim engagedby a spring-controlled pin. Y

Fig. 1 ofthe accompanying drawings represents a sectional View of the lock taken on the line A-B of Fig. 2 and shewing the elements in locking position,

Fig. 2, a side view of the mechanism, also shewing the elements in locking position,

Fig. 3 is another `view like Fig. 1, shewing the elements operated for unlocking,

Fig. 4 isy another side view of the mechanism, partly in section,

Fig. 5 is a sectional side view of part of the lock mechanism, and

Fig. 6 is a diagram of the top view of the lock. l

The lock casing 1 is fitted with a lock bolt 22 which is retained in shot position by abutment against the end 10 of the tumbler 5 which is supported by means of a semi-circular lug 14 on three locking discs 2, 3 and 4. A pivot pin 6 on the tumbler engages in an elongated slot 7 of the casing 1 which allows the tumbler to be lifted together with the pin. A pin 9, which is guided in a slot in the tumbler and controlled by a spring 8, bears against the casing 1 and holds the tumbler in engagement with'the locking discs. Each locking disc is adapted for rotary adjustment on a setting disc 27 whereby it is mounted on a spindle 24. The setting discs are toothed for engagement with pins 29 which are mounted in the locking discs and which enable the latter to be retained'in dit; ferent positions relative tothe setting discs in order to change'the combination of the lock. The pins 29 are controlled by springs 5 28. Each locking disc is provided with a notch l5 into which the lug 14 isadapted to drop so as to release. the bolt 22. This can only take place when the notches ofall the discs are in alignment. There is a second tumbler 13 which is pivoted at 11 andwhich rests by means of a lug 2O onthe locking disc 4. That portion of the latter'which supi ports the'tumbler 13 is reduced eccentrically, as Vshewn at 36 in Fig. 4, in the region of 65 the notch 15. A iiange 12 atthe free end of the tumbler 13 extends over the tumbler and forms a second abutment for the bolt 22 after the latter haspassed lthrough a fork 34 at the end 10 of the tumbler 5.

rllhe spindle 24 which is slidable and rotatable relative to the casing 1 as wellas to the setting discs 27, is used for adjusting the locking discs. For this purpose `it is fitted withtwo pins 25 controlled by springs 33 for engagement with which the discsy 3 and-4 are provided with notches. 26 and disc 2 with a shoulder 35. The disc aperture 3.7 is widened helically at one side` of the shoulder 35 so that driving engagement only takes place on a right hand rotation of the spindle. rPhe cen-tre disc 27 has merely a notch in which one of the pins 25 engages when the other one is thrown, by an a-Xial movement of the spindle, into co-operation' withl the respective outermost disc. vThus the centre disc will always be coupled to the spindle, and its locking disc 3 will participatein the rotary movement'thereof. :A toothed rim 17 which rises beyond the normalperiphery of. the disc 3, is engaged by a bevelled pin'19 which is controlled by spring 18 and serves as a stop for'the locking disc. The lug 14 of the tumbler 5 has a recess 16l wherein the rim 17 can'moveV wit-houtaffecting. the movementsot the tumbler.

The spindle is fitted with an' operating knob 23 and; with a dial 3Qwherebyit isvad-j justed relative to an index ring 31 onV the @sor trame; 199k bali-"2? @esagerare 90 mally in a staple or striking plate 38 and is operated by means of a handle 21 or any other suitable element.

The action is as follows:

The lock bolt 22 is normally retained by the tumbler 5 which is supported in operative position by one or more of the locking discs. In order to release the bolt, the locking discs must be adjusted in accordance with the prevailing combination/ V For this purpose the spindle 24 is first pushed back for engagement with the locking disc 4 and then turned to thel right until the dial 30 registers with the setting for this disc. The disc 3 participates inthe rotary movement and the pin 19 engages' the teeth of rim 17 and retains the disc 3 in its position. Then the spindle is pulled out for engagement with the disc 2`whichis similarly adjustedl with reference to the dial. Thereupon thehandle, without further axial adjustment of the same, is turned to the left for setting the disc 3,' this being also effected with reference to the dial. The notches 15 of the locking discs Will now be in alignment with one another opposite the lug 14of the tumbler 5, and the latter will therefore drop so as to allow the bolt 22 to be passed'in the direction of the arrow 32 through theY fork 34 of the tumbler. However, the bolt will still be blocked by the flange 12 of the tumbler 13 which bears against the reduced portion 36 of the disc 4. In order to free the bolt entirely, the disc 4 must be turned for whichy purpose the spindle 24 is again pushed into engagement with this disc and turned to the right so as to raise the flange 12 and enable the bolt to pass'in between the latter and the tumbler 5 for complete retraction. In this operation the tumbler 5, which is engaged by the bolt 22, will be deiected about the fork 34 in opposition to the spring-controlled pin 9.

The second operation ofthe spindle will havethe eiiect of throwingv the locking discs out of order before the lock is completely open, and a risk of Aleaving the lock in ope position will thus be eliminated.

I claim:

1. A lock comprising a casing, a spindle slidably and rotatably mounted in said casing, a plurality of locking discs mounted on the spindle, means on said spindle for setting said locking discs each disc having a peripheral notch, a principal, spring-,controlled tumbler guided vertically in the casing, a rounded lug on said tumbler supporting the latter on the locking discs and adapted to drop into the notches thereof when said notches are in alignment, vmeans on' the spindle for turning thev different discsso as to bring the notches into alignment under the lug, a lock bolt arranged so as to be normally blocked in shot position by abutment Aagainst the end of said tumbler and so as to be ref leased Qu the tumbler Ydropping mmh@ notches, and an additional tumbler supported on an eccentric portion of one of the discs and adapted to prevent the complete withdrawal of the bolt until said latter disc has been turned from the position in which its notch registers with the lug of the principal tumbler. c

2. A lock bolt comprising a casin a spindle slidably and rotatably mounted in said casing, a plurality of locking discs mounted on the spindle, each disc having a peripheral notch, a spring-controlled tumbler guided vertically in the casing, a lug on said tumbler supporting the latter on the locking discs and adapted to drop into the notches thereof when said notches are in alignment, means on the spindle for turning the dierent discs so as to bring the notches intoalignment under the lug, a lock bolt arrangedV so as to be normally locked in shot position lby abutment against the end of Vsaid tumbler and so as to be released on the tumbler dropping into the disc notches, one of the locking discs being permanently coupledV tothe spindle for rotary movement, a raised toothed rim on said latter disc, the tumbler lug having arecess in which said rim isaccommodated, and a spring-pressed pin co-operating with the teeth of said rim for holding the disc.

THEODOR KROMER.

(ses 

